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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e52a9e1a0d1216d764a9585bb21f6c5d81f93cf5911ddec90df0945aaabd994' 
  AND token = 'aVyemPzZ5nUbp+TwafkkMzYW93+Xp/VzBuHzlVrYzLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}